Double column storage tower



FIG. 1 is a perspective view of a double column storage tower of thepresent invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof; the left sideelevational view being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The dotted line showings in the drawings of stored cases are forenvironmental purposes only and form no part of the claimed design.

The ornamental design for a double column storage tower, as shown anddescribed.